Improvement in processes of refining sugar



FRANZ O. MATTHIESSEN, OF NEW YORK, N. Y.

IMPROVEMENT IN PROCESSES OF REFINING SUGAR.

Specification forming part of Letters Patent No. 162.243, dated April20, 1875; application filed April 12, 1875.

CASE B.

To all whom it may concern:

Be it known that I, FRANZ O. MATTHIEssEN, of New York, N. Y., haveinvented an Improved Process of Refilling Sugar, of which the followingis a specification:

My improvement relates to a modification of that process of refiningsugar whereby the entire sugar-mass is converted into coffeesugarwithout leaving any fluid remainder in the form of sirup.

As I have invented several modifications in this process, for which I amabout applying for patents, I shall, for convenience, designate thepresent application as Case B.

The modification of the process to which the present application refersincludes the boiling of the clarified sugar-liquor in the vacuum-panuntil the usual crystallization has taken place 3 but, instead ofmechanically separating the crystals and reboiling the sirup, the entirecontents of the vacuum-pan is discharged directly into shallow trays orpans, and, being thus divided into thin layers, is subjected to gentleheat in the open air, and a consequent prolongation of the processes ofevaporation and crystallization, until nearly all the water contained inthe material operated upon has been evaporated, and it has acquired thecondition of a granular mass substantially like what is known ascoffee-sugar, the slight portion of sirup present being adherent to thesugar-crystals. The heat of the sirup itself as it comes from thevacuumpan is thus utilized for the purpose of promoting evaporation, butan additional application of heat will usually be required to preventthe cooling of the sugar-mass and complete the operation. Care must betaken not to allow the temperature to exceed 212 Fahrenheit, and it ispreferable to conduct the process to completion at a lower temperaturethan that.

The distinctive characteristic of the present invention is the immediatesubjection of the divided sugar-mass discharged from the vacuum-pan to aprocess of gentle evaporation in the open air.

I claim as my invention- The improved process of refining sugar hereindescribed, which consists, in addition to the ordinary boiling of theclarified sugarliquor in the vacuum-pan, in dividing the hot sirup andcrystallized sugar discharged from the vacuum-pan into small masses orthin layers, and subjecting such small masses or thin layers to aprocess of gentle evaporation, conducted in the open air, and prolongeduntil sufficient water has been expelled from the material operated uponto convert it into a granular mass, as set forth.

F. O. MATTHIESSEN.

Witnesses:

M. L. SENDERLING, O. H. KRAUSE.

